Tunnel-kiln.



C. DBESSLER.

TUNNEL i MAY 24, 1916.

APPLICATKON FILED CONRAD DBESSLER, OF MARLOW, ENGLAND.

TUNNEL-KELLY.

Specification of Letters Eatent.

Patented May 8, 1917.

Application filed Kay 24, 1916. Serial No. 99,535.

To all whom it may concern:

Be it known that 1, Conan) Dnn'ssiinn, a subject of the King of Great Britain and lrcland, residing at Marlow, in the county of Bucks, England, have invented certain new and useful Improvements in Tunnel- Kilns, of which the fpllowing is specification,

My in ention relates to tunnel is of the type described in my prior Patents Nos. 102L628 dated April 16, 1912 and 1,116,036 dated Nov. 3, 1914. In the construction described in such patents, the combustion chambers are arranged longitudinally along each side of the door of the tunnel oven, and adapted to be fed with a combustible gas at one point, the products ofcombustion finding egress through a chimney at the opposite end. With such a construction, the temperature is highest at the point of introduction of the combustible gas, and lowest at the point of egress of the gas. For kilns where a high temperature at the inlet end and a lower temperature at the outlet end is desirable, such construction has been found etiicient. For kilns where a'moderate temperature at the inlet end, a high temperature at the center and a lower temperature at the outlet end is desirable, such construction has been found faulty.

The purpose of my present invention, therefore, is a. construction in which the temperature atdifferent points along the length of the kiln may be regulated, as desired, and this regulation accomplished l. by connecting the source oi combustible gas to the combustion chambers at diderent portions of their length, and the provision of valves whereby the amount of combustible e'as and air introduced may be varied as desired. The accompanying drawings will serve to illustrate my invention, in which, Figure l is a horizontal section approximately on the line ll otzl ig. '2, Fig. 2 is a sectional elevation, the section being approximately on the line il ll of Fig. I. Fig. 3 is a 'transverse section on the line lll.lll of Fig. 2. Fig. i is a (ltllillltti,HW'llUllill view on the line lV-IV of Fig. l.

Referring to the drawings: 1 represents the combustion chambers arranged longitudinally of the hearth ot' thrbar-losing chamber The combustion chambers are divided into sections 3, and interposed between the sections are sleeves 4, which receive the ends of adjacent sections 3, and

allow them to expand and contract therein. Connected to the sleeves L at one side, are tubes 5. The tubes are located in the opp.o site side .walls of the inclosing chamber 2. Projecting into the tubes 5 are burners 6, connected at-the rear end to agas delivery pipe 7. The burners 6 are of the usual type, provided with air controlling dampers 8. The outer ends of tubes 5 are situated in a sleeve 9, located in the outer surface of the wall 01" the inclosing chamber 2. The tubes 5 are adapted tobe freely movable, to compensate forexpansion and contraction in the sleeves 1 and 9. The gas sup lied to the burners 6, is controlled by va i ves 10. Located at the forward end of the chambers 1 (i. 0., the entrance end of the kiln) are furnaces 11, as shown in Fig. 4. These furnaces are of the usual construction. place of the furnaces, gas and air burners mav be used, as disclosed in my prior Patent No. 1,023,628.

The combustion chambers 1 are connected at their rear end to a chimney stack 12, at the delivery end of the kiln. Located within the bottom of the inclosing chamber 2, is a trackway 13, on which is mounted a truck 14 to carry the articles 15 to be treated in the kiln. I

The operation of the kiln is as follows:

lndcr ordinary conditions,-the combustion chambers are heated by means of hen units derived from the fuel in the furnaces 1, or asbefore stated, from the gas and air burners which take the place of the furnaces. The heat derived from the combustion of fuel in the furnaces 11, is supplemented by the heat derived from the combustion of gas and air at any of the burners 6. In treatingv various articles, it is desirable to'have-the temperature at the entrance and of the inclosing chamber 2, comparatively moderate. This temperature, in such case, derived from the furnaces 11, and to have the temperature at the center of the furnace highsufficiently high to vitrily the articles treated-this temperature is deri ed from the furnaces 11, added to by the temperatu e at the burners (3 at the center of the furnace. The temperature at the rear end of the inclosing chamber will be that due to the tcnu'ierature derived from the furnace 11. as modified by'the loss ottemperature along the length c" the furnace, or that due 'to one or more of the burners 0 when in operation, as modified by the length of'the furnace, orthat' due to the temperature of the furnace 11 plus that of the burners 6, which temperature at the rear end of the inclosing chan'iljier may be high or low as desired. It will be readily understood that by the arrangenwnt disclosed, I. can regulate the temperature along the chamber 2 for 'arying conditions.

Having thus described my invention, I claim:

1, A tunnel oven of the type described, comprising an ii'iclosing chamber, a combustion chamber arral'iged longitudinally on each side of the inclosing chamber, and adapted to heat by radiation and discharge the products of combustion exterior to the inclosing chamber, means for heating the combustion chamber, and means for regulating the heating means.

2. A tunnel oven of the type described, comprising an inclosing chamber, a combustion chamber arranged longitudinally on each side of the inclosing chamber, and adapted to heat by radiation and discharge the products of combustion exterior to the inclosing chamber, means for heating the combustion chamber situated at one end thereof, means for-heating the combustion chamber situated at sections of the length thereof, and means for conveying the products of combustion from the combustion chambers.

A tunnel oven of the type described, comprising an inclosing chamber, a combustion chamber arranged longitudinally along the floor at each side of the inclosing chamber and adapted to heat by radiation and discharge the products of combustion exterior to the'inclosing chamber, means for heating the combustion chamber situated at one end thereof, means for heating the combustion chamber situated at a distance from each other and along the length of said chamber, and means for conveyingthe products of combustion from the con'ibustion chamber. y

4. A tunnel oven of the type described, comprising an inclosing chamber, a combustion chamber arrangedlongitudinally on each side of theinclosing chamber and adapted to heat by radiation and discharge the products of combustion exterior to the inclosing chamber, said combustion chamber consisting of a series of sections and a series of inteiposed sleeves, means for heating the combustion chamber located along the length thereof, and means for controlling .the supply of heat.

A tunnel oven of the type described, 7

con'iprising an inclosing chamber, a combus tion chamber arranged loi'igitudinally on each side of the incl'osing chamberand adapted to heat bvradi, tion and discharge the products'ot' combustion exterior to the inclosing chamber, means for heating the combustion chamber situated at one end thereof, means consisting of gas and air burners arranged at intervals along said combustion chamber, and means for controlling the heat at the gas and air burners.

(3. A tunnel oven of the type described,

con'lprising an inclosing chamber, a combustion chamber arranged longitudinally on *ach sideof the inclosing chamber and adapted to heat by radiation and dischargehe products of combustion exterior to the inclosing chamber, a series of tubes arranged in the walls of the inclosing chamber and communicating with the combustion chamber, a series of gas and air burners situated in said tubes, a gas supply pipe, means for regulating the supply of gas, means for regulating the supply of air to said burners, and an exhaust flue from said combustion chamber.

7. A tunnel oven of the type described, comprising an inclosing chamber, a combustion chamber formed of a series of communicating sections arranged longitudinally on each side of the inclosing chamber and adapted to heat by radiation and discharge the products of combustion exterior to the inclosing chamber, a series of tubes extending throiigh the walls of the inclosing chamber and communicating with each section .of the combustion chamber, gas and air burners extending into each of said tubes, means for feeding gas and air to said burn ers, means for regulating the gas and air fed to the burners, a source of gas supply, and means for conveying the products of combustion from the combustion chamber.

, 8; A tunnel oven of the type described, comprising an inclosing chan'iber, a combustion chamber arranged longitudinally on each side of the inclosing chamber and adapted to heat by radiation and discharge the products of combustion exterior to the inclosing chamber, each combustion cham ber consisting of a series of sections, a, series of sleeves within which the sections may expand and contract, a series of tubes communicating with the sections Within which said tubes may expand and contract, and a series of sleeves arranged external to the chamber walls and inrlosing the outer ends of said tubes, gas burners located in said tubes, means for supplying gas and air to said burners, and means for conveying the products of combustion from the combustion chan'ibers.

In testimony when-oil allix mysignaturc, in the presence of two \vitiiesscs. CONRAD DRICSSTJI'R. lVitne a-vs:

nu/rm: S. Kirri'mi V ic'rou (11am K, 

